To get to Oceanus, you need to get scuba equipment and swim to the bottom of the ocean where a portal awaits. Without the scuba stuff you'd drown. Waterkin are intermediate mobs that drop scales and then Poseidon, their king, lives inside an underwater castle (pretty much a reverse dungeon). You must get to the top where he awaits and he drops watercrystal which is the final ingredient for the water scale armour. Medium defense with set bonus of not drowning with it on.

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